The 2500 telephone is designed for use behind a registered PBX system. The telephone user or system installer must supply an RJ-11 modular wall jack to connect this telephone to the PBX system. The PBX "station port" type must be "Industry Standard Analog" or "POTS". This telephone cannot be used with "digital" PBX station ports.
Ringer Volume. Hearing Aid-Compatible Handset. Handset Jack. Data Port. Dialing Keys. Volume Switch. Message Waiting Light.